Six Panel Polished Composite Door is available in thickness of 30 mm in various pre-moulded plain design finishes on both faces. Granalite offers Six Panel Polished Composite Door. Granalite supplies a wide range of synthetic Granite and Marble artefacts and composite doors for use in building and architectural applications. The Six Panel Polished Composite Door is made from all season, weather resistant Polyester Gelcoat followed by laminating polyester resin and 450 GSM glass mat with superior structural gluing based on hand lay.